package net.xdclass.util;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.sun.deploy.net.HttpResponse;
import lombok.extern.slf4j.Slf4j;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.security.MessageDigest;
import java.util.Random;
import java.util.UUID;

@Slf4j
public class CommonUtil {
    /**
     * 获取ip
     * @param request
     * @return
     */
    public static String getIpAddr(HttpServletRequest request) {
        String ipAddress = null;
        try {
            ipAddress = request.getHeader("x-forwarded-for");
            if (ipAddress == null ||
                    ipAddress.length() == 0 ||
                    "unknown".equalsIgnoreCase(ipAddress)) {
                ipAddress =
                        request.getHeader("Proxy-Client-IP");
            }
            if (ipAddress == null ||
                    ipAddress.length() == 0 ||
                    "unknown".equalsIgnoreCase(ipAddress)) {
                ipAddress =
                        request.getHeader("WL-Proxy-Client-IP");
            }
            if (ipAddress == null ||
                    ipAddress.length() == 0 ||
                    "unknown".equalsIgnoreCase(ipAddress)) {
                ipAddress =
                        request.getRemoteAddr();
                if
                (ipAddress.equals("127.0.0.1")) {
                    // 根据⽹卡取本机配置的IP
                    InetAddress inet = null;
                    try {
                        inet =
                                InetAddress.getLocalHost();
                    } catch
                    (UnknownHostException e) {
                        e.printStackTrace();
                    }
                    ipAddress =
                            inet.getHostAddress();
                }
            }
            // 对于通过多个代理的情况，第⼀个IP为客户端真实IP,多个IP按照','分割
            if (ipAddress != null &&
                    ipAddress.length() > 15) {
                // "***.***.***.***".length()
                // = 15
                if (ipAddress.indexOf(",") > 0)
                {
                    ipAddress =
                            ipAddress.substring(0, ipAddress.indexOf(","));
                }
            }
        } catch (Exception e) {
            ipAddress="";
        }
        return ipAddress;
    }

    public static String MD5(String data) {
        try {
            java.security.MessageDigest md =
                    MessageDigest.getInstance("MD5");
            byte[] array =
                    md.digest(data.getBytes("UTF-8"));
            StringBuilder sb = new
                    StringBuilder();
            for (byte item : array) {
                sb.append(Integer.toHexString((item & 0xFF) | 0x100).substring(1, 3));
            }
            return sb.toString().toUpperCase();
        } catch (Exception exception) {
        }
        return null;
    }

    public static String getRandomCode(int length) {
        String sources = "0123456789";
        Random random = new Random();
        StringBuffer sb = new StringBuffer();
        for(int i =0;i<length;i++){
            sb.append(sources.charAt(random.nextInt(10)));
        }
        return sb.toString();
    }

    public static long getCurrentTimeStamp(){
        return System.currentTimeMillis();
    }

    public static String getUUID(){
        return UUID.randomUUID().toString().replaceAll("-", "").substring(0, 32);
    }

    public static String getStringNumRandom(int length) {
        String sources = "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
        StringBuilder stringBuilder = new StringBuilder();
        Random random = new Random();
        for (int i=0;i<length;i++){
            stringBuilder.append(sources.charAt(random.nextInt(sources.length())));
        }
        return stringBuilder.toString();
    }

    public static void responseJson(HttpServletResponse response,Object o){
        ObjectMapper objectMapper = new ObjectMapper();
        response.setContentType("application/json; charset=UTF-8");
        try (PrintWriter writer = response.getWriter()) {
            writer.print(objectMapper.writeValueAsString(o));
        } catch (Exception e) {
            log.error("响应json数据给前端异常");

        }
    }
}
